Loom for weaving tufted pile fabrics



Aug. 4, 1953 I. a. BASSINDALE LOOM FOR WEAVING TUFTED FILE FABRICS Filed Sept. 15, 1950 2 Sheets-Sheet l I Aug. 4, 1953 I. B. BASSINDALE 2,647,543

LOOM FOR WEAVING TUFTED FILE FABRICS Filed Sept. 13, 1950 2 Sheets-Sheet 2 17 48 l I 1y 25 25 i i I 1 I i i I 21 9 a 24 z i 25 I 2/ Patented Aug. 4, 1953 2,647,543 LOOM FOR WEAVING TUFTED PILE FABRICS Isaac Bradley Bassindale, Oldham, England, as-

signor to Platt Brothers and Company Limited,

Oldham, England Application September 13, 1950, Serial No. 184,551 In Great Britain September 15, 1949 and spools of tuft yarn are each suspended from' the carrier chains by means of spring-influenced hooks pivotally mounted on end plates at opposite ends of the tube frame.

The said hooks, hereafter for convenience referred to as chain-hooks, are mounted on the tube frame end platesin such manner as to be capable of projection and retraction laterally and are each furnished with a projection or tail extending laterally within the tube frame to form a hinge on which the hook may be retracted and disengaged from the carrying chains by the clasps.

It sometimes happens that a chain-hook becomes damaged, e. g., by rough usage of a tube frame when out of the loom, and is distortedout of correct positionso that when the transferring arms operate on, the clasps, to release the chain-hook the catch does not properly leave the chain and the tube frame jams and, failing to leave the chains, holds up the transferring arms with resultant damage to the loom.

To avoid this happening I provide an electricalstop motion device of the type described in the specification filed with co-pending application for Letters Patent No. 150,272, filed March 17, 1950, adapted to be brought into operationto stop the loom should a tube frame jam and prevent the downward movement of the transferring arms.

The present invention consists in electrically operated stop motion means of the type referred to for the transferring mechanism for the tube frames of a spool Axminster carpet loom in combination with means for bringing said stop motion into operation including a lever mounted on the pivot shaft of said transferring mecha-.- nism and adapted to oscillate with said shaft in the movement of the transferring arms, and a spring-influenced plunger located in the path of movement of said lever and secured to the loom frame but insulated therefrom, said plunger forming one terminal contact in the low voltage electrical circuit of the stop motion, the other terminal of which is formed by the loom frame.

2 Claims. (Cl. 139-336) The said electrical stop motion means is characterised in that the cam-operated switch in the low voltage electrical circuit of the stop motion is opened during the initial upward movement of the transferring arms whereby to maintain the low voltage electrical circuit open during the normal working of the loom even when the contacts are bridged at the end of the upward move-,

ment of the transferring arms andis not closed until after the said contacts have been opened in the descent of the transferring arms so that the circuit is still open and not until the contacts are maintained closed by failure of the transferring arms to descend followed bythe subsequent closing of the cam-operated switch is the low-voltage circuit completed to bring about stoppage of the loom.

The invention will now be described with the aid ofthe accompanying drawings in which only so much of a spool Axminster carpet loom is shown as is necessary for a clear understanding of the invention.

In the drawings Fig. 1 is a fragmentary side elevation of the transferring mechanism of a spool Axminster carpet loom with the invention applied thereto, the transferring arms being shown moving downwards and carrying the tube frame; Fig. 2 is a plan of Fig. 1; Fig. 3 is a side elevation, and Fig. 4 a plan, drawnto a larger scale, of a spring-influenced contact terminal shown in Fig. land later to be described.

Referring to Figs. 1 and 2 of the drawings, I0 indicates a part of the loom frame; I I a chain wheel sprocket; [2 the carrying chain; l3 one of the transferring arms; l4 a shaft on which the transferring arms are pivoted; l5 clasping means, and IS a tube frame, all these parts being of known construction and operating in known manner.

In a practical embodiment of the invention as applied to a spool Axminster carpet loom, and illustrated in the drawings, I provide on the pivot shaft I4 of the tube frame transferring arms l3 a lever I 1 adapted to oscillate with the said shaft l4 in movement of the transferring arms l3. Located in the path of movement of the lever I1 is a spring-influenced plunger l8 secured to the loom frame I0 but electrically insulated therefrom and forming one terminal contact in a low voltage electrical circuit, the other terminal of which is formed by the loom.

The plunger I8 is slidably mounted in lugs projecting from a bracket [9 secured to the loom frame I0 from which it is insulated by a plate 20 of insulating material interposed between the bracket 19 and the loom frame I0. The bracket I9 is secured to the loom frame It! by screw bolts 2| penetrating insulation bushes 22 in the bracket 19, a washer 23 of insulating material being interposed between the nuts 2:1 of the bolts 2! and the bracket. A spring 25 serves to hold the plunger I8 in operative position.

The bracket I9 is inelectrical connection with the transformer in the low voltage circuit by a lead indicated at 26.

As described in the before-mentioned specification, this low voltage electrical circuit is'normally kept open by a cam-operated switch. this switch being closed when the transferring arms have made a slight initial downward movement.

In the normal working of the loom he upward movement of the transferring arm's r3 would cause the lever I! to make contact with the spring-influenced plunger l8, but, as the electrical circuit is open, due to the cam-operated switch not having yet been closed, the contact would have no effect and the loom would continue to work. In the return movement of the transferring arms it the lever ll breaks contact with the spring-influenced plunger H3 before the cam-operated switch is closed and the normal working of the loom proceeds.

Should the transferring arms 3 for any reason fail to descend the lever i! would. be maintained in contact with the spring-influenced plunger 18 whereupon when the cam-operated switch is closed the low voltage circuit would be completed. Completion of said circuit serves to energise a relay which in turn operates the starter to break the electric circuit to the driving motor and bring about stoppage of said motor whereupon the loom is brought to a standstill before any damage is sustained.

The cam-operated switch in the low voltage electrical circuit is opened during the initial upward movement of, the transferring arms 13 whereb to maintain an open circuit during the normal working of the loom even when the aforesaid contacts are bridged at. the end of the upward movement of the transferring arms The cam-operated switch is not closed until after the aforesaid contacts have been opened in the descent of the transferring arms [3, therefore the circuit is still open. It is not until the contacts are maintained closed, by the transferring c arms l3 being prevented from descending, followed by the closing of the cam-operated switch,

that the low voltage circuit is completed to bring about stoppage of the loom.

What I claim is:

1. Electrically operated stop motion means of the type referred to for the transferring mechanism for the tube frames of a spool Axminster carpet loom and which is carried on a pivot shaft mounted in the loom frame, in combination with means for bringing said stop motion means into operation, including a lever mounted on the pivot shaft of said transferring mechanism and adapted to oscillate with said shaft in the movement of the transferring arms, a bracket secured to the loom frame but insulated therefrom, and a springeinfluenced plunger located in the path of movement of said lever and slidably mounted said bracketysaid plunger forming one tershaft and adapted to oscillate with said shaft in the movement of the transferring arm, a bracket secured to the loom frame and insulated therefrom, and a spring-influenced plunger located in the path of movement of said lever and ,slidably mounted in said bracket, said plunger constituting one terminal contact and said lever constituting the other terminal contact of the stop motion means, said lever being movable into and out of contact respectively with said plunger in the upward and downward movement of said transferring arm, said lever remaining in contact with said plunger if said transferring arm fails to move downwardly during the operation of the loom.

ISAAC BRADLEY BASSINDALE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,306,280 RObb s DEC. 22, 1942 2,365,003 Robb Dec. 12, 1944 

